Control unit for an alarm system



FIG. 1 is a top plan view of a control unit for an alarm system showing our new design;

FIG. 2 is a right side elevational view thereof, with the opposite side being a mirror image;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for an ornamental control unit for an alarm system, as shown and described. 